Adam answered:
Everytime there is a change to a fixlet by IBM Dev, the baseline that has that fixlet goes out of synch. You can use the Baseline Synchronization dashboard to manage synchronization. Once you synchronize or edit your baseline you then need to stop any actions taken off of those baselines and reissue those actions again.
Baseline Best Practices: http://www.ibm.com/support/docview.wss?uid=swg21636385